Hydroisomerization
of n-hexadecane was investigated over the bifunctional
catalysts Pt/ZSM-23, as a model reaction for n-paraffin
dewaxing. Effort has been made to improve the selectivity to iso-hexadecane by introducing the magnesium promoter. The
catalytic performances between Pt/ZSM-23 and magnesium promoted Pt/ZSM-23
were compared in terms of the correlation between conversion and selectivity.
Magnesium promoter resulted in the changes of acidity and the dispersion
of Pt metal; the acid amount decreased, and the Lewis acid sites increased.
The dispersion of Pt metal was also improved. Magnesium-promoted Pt/ZSM-23
showed a higher yield of iso-hexadcanes due to its
Lewis type acidic properties and higher Pt dispersion.
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